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If you did not have this hassle before you went to 10 and now have it after reverting to 7, you have succeeded in damaging your original win 7 installation.

Upgrading should only be done when you are having issues with newer programs that are vital to your operation. But if your computer is working fine, there is never a need for an upgrade that very often causes many initial problems. You have learned the hard way.

Cross your fingers and try to do a repair operation with your win 7 disks. Just hope that the repair operation deals with the damaged area; many times it does not and you have to reinstall from scratch.

The issue can be caused by the damaged system files or hardware device.

I suggest trying the following method to troubleshoot the issue:

Startup Repair from the Windows Recovery Environment (WinRE)
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1. Insert the Windows Vista installation disc into the disc drive, and then start the computer.
2. Press a key when the message indicating "Press any key to boot from CD or DVD ...". appears.
3. Select a language, a time and currency, and a keyboard or input method, and then click Next.
4. Click Repair your computer.
5. In the System Recovery Options dialog box, choose the drive of your Windows installation and click Next.
6. At the System Recovery Options Dialog Box, click on Repair your computer.
7. Click the operating system that you want to repair, and then click Next.
8. In the System Recovery Options dialog box, click Startup Repair.

Please continue with the following instructions if the above suggestion does not help:

1. Put the Windows Vista installation disc in the disc drive, and then start the computer.
2. Press a key when the message indicating "Press any key to boot from CD or DVD ..." appears.
3. Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
4. Click Repair your computer.
5. (Click the operating system that you want to repair), and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type "chkdsk /F C:" (without quotation marks) and click Enter.
8. Restart the computer and have a test.

If the issue still exits, please move to the below steps:

In-place Upgrade Installation-----------------------------------------
Technically, you won't lose any data to take an In-place Upgrade Installation. In order to avoid any unexpected problem, I suggest you backup your data before taking In-place Upgrade Installation.

1. Start the computer by using the current Operating System.
2. Insert the Windows Vista DVD in the computer's DVD drive.
3. Use one of the following procedures, as appropriate:
• If Windows automatically detects the DVD, the Install now screen appears.
Click Install now.
• If Windows does not automatically detect the DVD, follow these steps:
a. Click Start, type (Drive: )\setup.exe in the Start Search box, and then clickEnter.Note:(Drive: ) is the drive letter of the computer's DVD drive.
b. Click Install now.
4. When you reach the "Which type of installation do you want?" screen, click Upgrade to upgrade the current operating system to Windows Vista.

Step 1:windows 8 upgrade b> Run the Windows 8 Upgrade Assistant :http://windows.microsoft.com/en-US/windows-8/upgrade-to-windows-8. Note: To make sure the system is compatible visit http://windows.microsoft.com/en-US/windows-8/system-requirements. http://windows.microsoft.com/en-US/windows-8/upgrade-to-windows-8 b> When making significant changes to your computer such as an upgrade, it is always recommended you backup your system prior to installing a new version of Windows. Thankfully, all editions of Windows 7 includes system imaging, which means you can backup your entire Windows 7 installation and restore it if it fails. Learn more about how to backup your Window 7 installation here In addition to System Imaging, you can backup just your personal files using Backup and Restore, to do that, check out the following article: http://notebooks.com/2010/12/27/how-to-backup-to-an-external-hard-drive/http://notebooks.com/2011/02/25/how-to-restore-a-backup-from-an-external-hard-drive-in-windows-7/ If you want to backup themes, wallpapers and other minor features, Windows Easy Transfer is another option, you can learn more about it hereWhat you can do before attempting the upgrade? You can do some pre-requisite tasks to ensure a smooth migration from Windows 7 to Windows 8. If you are using a name branded computer such as a Dell or HP, go to the manufacturers website for the model computer you are using and download the latest available drivers for that computer. Store them on a disc or USB thumb drive. Important drivers you should try to obtain include Network and Video Drivers. Its possible that they might just have Windows Vista or Windows 7 drivers, those will work with Windows 8. Other things you can do: Uninstall any security software before attempting to upgrade. Disable any encryption software you might have installed. Disable/uninstall disk utility software such as DVD/CD burning utilities or third party defragment programs such as Perfect Disk. Make sure your computer is updated (devices and applications). Disconnect any external devices before installing. Check your hard disk for any errors: - Click Start - Type: CMD - Right click CMD then click Run as administrator At the Command Prompt, type: chkdsk /r /f Exit the command prompt. When you restart your system, your computer will be scanned for errors and attempts will be made to correct them. Another thing you can do is disable Start items: Click Start Type: MSCONFIG. Hit Enter on your keyboard On the General tab, click Selective Startup. Under Selective Startup, click to clear the Load Startup Items check box. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All. Click OK. When you are prompted, click Restart. After the computer starts, check whether the problem is resolved. Run the System File Checker utility. SFC/Scannow checks your Windows installation for errors and corrects them. This will help with ensuring that a smooth upgrade occurs. Click Start Type: CMD, from the results, right click CMD

Click 'Run as Administrator' At the Command Prompt, type: sfc/scannow This will check for any integrity violations Restart your system

Hello Sir. your PC3200 DDR (PC400) is not compatible with the dimension 3000, get a PC2700 (PC333) instead. or upgrade your motherboard to use a PC3200. BTW 2GB on an XP is too much memory. Use Vista, your processor lags. Its wiser to upgrade your motherboard and processor.

Just start taking things apart, download manuals and direction for the internet so that you understand what you are doing and why. If you take your time and allow no mystery to unsolved, keep searching until you come to not just an answer but the right answer that make it work once again. You'll enjoy it.There are no short cut...in life or computers. The more you learn, you'll discover the more there is to learn. It changes rapidly and stays the same. If you love it you will do well. Help people, the money will come later. Fix computers just to fix them, you will learn much more and faster.Good fortune, grasshopper...please leave rating.